Remove deprecated sphinx-hoverxref extension

[Copilot]

The sphinx-hoverxref extension has been deprecated by ReadTheDocs. Link preview functionality is now provided via the RTD admin dashboard (Settings > Addons > Link previews).

Changes

• Remove sphinx-hoverxref from root requirements.txt
• Remove .hxr-hoverxref CSS styling from docs/source/_static/custom.css

No RST files used the :hoverxref: role and the extension was not configured in conf.py, so only the dependency and unused CSS needed removal.

Original prompt

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This section details on the original issue you should resolve

<issue_title>hoverxref deprecated</issue_title>
<issue_description>https://github.com/readthedocs/sphinx-hoverxref</issue_description>

Comments on the Issue (you are @copilot in this section)

@jpfeuffer Their link preview addon is trash. So basically we have to say goodbye to hoverrefs.

Thank you sphinx.</comment_new>
<comment_new>@jpfeuffer
Probably all the extra logic for hoverrefs needs to go. Maybe then the links work as normal.</comment_new>
<comment_new>@timosachsenberg
This extension has been deprecated. Users are advised to enable the "Link previews" option in "Settings" > "Addons" > "Link previews"
in the Read the Docs admin dashboard for their project to get the same functionality as this extension.

For more information, please see:

1. https://docs.readthedocs.com/platform/stable/link-previews.html
2. https://about.readthedocs.com/blog/2024/07/addons-by-default/</comment_new>

• Fixes hoverxref deprecated #486

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